Identification Data |
Common Name | |
Constellation | Taurus |
Star Name | 81 Tau |
Skymap Number | 4300119 |
Henry Draper (HD) Number | 28546 |
Harvard Revised (HR) Number | 1428 |
SAO Number | 93978 |
Durchmusterung (DM) Number | BD+15 639 |
Washington Double Stars (WDS) Number
| 04306+1542
|
Positional Data |
Position and Proper Motion (PPM) Number | 119971 |
Right Ascension (RA) J2000 | 4h 30m 38.889s |
Declination (Dec) J2000 | +15° 41' 30.765" |
Position Uncertainty | 0.0120s |
Proper Motion in RA (J2000)/cos(Dec) | +0.00721 |
Proper Motion in Dec (J2000) | -0.024366 |
Radial Velocity | +039.2km s-1 |
Trigonometric Parallax | +0.02255s |
Trigonometric Parallax Uncertainty | 0.00109s |
GCI Unit Vector in X (J2000) | 0.365904 |
GCI Unit Vector in Y (J2000) | 0.890485 |
GCI Unit Vector in Z (J2000) | 0.270464 |
Galactic Longitude | 180.82° |
Galactic Latitude
| -21.75°
|
Observational Data |
Observed Visual Magnitude (V) | 5.46 |
Derived Visual Magnitude | |
Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.004 |
Observed B Magnitude | 5.73 |
Observed B-V Colour | +0.267 |
Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.005 |
Observed U Magnitude | |
Observed U-B Colour | |
Observed U Magnitude or (U-B) Magnitude Uncertainty | |
Observed Photovisual Magnitude | 5.5 |
Observed Photographic Magnitude | 5.8 |
Morgan Keenan (MK) Spectral Type | A5m |
One-Dimensional Spectral Class | A5 |
Position Angle | 339 |
Year of Observation | 1919. AD |